Supported Ag catalysts for the lean reduction of NO with C3H6

K. A. Bethke, Harold H Kung

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302 Citations (Scopus)

Abstract

The activities of 2 and 6 wt% Ag/Al2O3 catalysts for lean NO reduction with C3H6 were compared. High conversions of NO to N2 were obtained over 2 wt% Ag/Al2O3. In contrast, the NO conversions to N2 were much lower over 6 wt% Ag/Al2O3, and this catalyst formed a substantial amount of N2O. The difference in the behavior of the two catalysts was attributed to the much higher Ag dispersion for the 2 wt% than the 6 wt% sample, such that the oxidation states of Ag were different under reaction conditions. The 2 wt% Ag/Al2O3 was believed to contain silver in the +1 oxidation state under reaction conditions, while the 6 wt% Ag/Al2O3 catalyst contained Ag0 particles, the amount of which decreased at higher temperatures. The presence of Ag0 resulted in a high rate of C3H6 combustion at the expense of NOx reduction. A synergistic effect was observed over a mixture of Al2O3 and 2 or 6 wt% Ag/Al2O3 and was attributed to the transfer of a very short-lived intermediate from Al2O3 to Ag/Al2O3 or vice versa.

Original languageEnglish
Pages (from-to)93-102
Number of pages10
JournalJournal of Catalysis
Volume172
Issue number1
Publication statusPublished - 1997

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catalysts
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Oxidation
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ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Supported Ag catalysts for the lean reduction of NO with C3H6. / Bethke, K. A.; Kung, Harold H.

In: Journal of Catalysis, Vol. 172, No. 1, 1997, p. 93-102.

Research output: Contribution to journalArticle

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AB - The activities of 2 and 6 wt% Ag/Al2O3 catalysts for lean NO reduction with C3H6 were compared. High conversions of NO to N2 were obtained over 2 wt% Ag/Al2O3. In contrast, the NO conversions to N2 were much lower over 6 wt% Ag/Al2O3, and this catalyst formed a substantial amount of N2O. The difference in the behavior of the two catalysts was attributed to the much higher Ag dispersion for the 2 wt% than the 6 wt% sample, such that the oxidation states of Ag were different under reaction conditions. The 2 wt% Ag/Al2O3 was believed to contain silver in the +1 oxidation state under reaction conditions, while the 6 wt% Ag/Al2O3 catalyst contained Ag0 particles, the amount of which decreased at higher temperatures. The presence of Ag0 resulted in a high rate of C3H6 combustion at the expense of NOx reduction. A synergistic effect was observed over a mixture of Al2O3 and 2 or 6 wt% Ag/Al2O3 and was attributed to the transfer of a very short-lived intermediate from Al2O3 to Ag/Al2O3 or vice versa.

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